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隔膜压力表的特性有哪些
信息来源: 华恒 | [ 2019-04-29] 点击量: 214

   隔膜压力表的特性有哪些?西安华恒仪表介绍:隔膜压力表的特性为:

 
  What are the characteristics of the diaphragm pressure gauge?Introduction of Xi'an Huaheng Instrument:The characteristics of diaphragm pressure gauge are as follows:
 
  1、隔膜压力表的灌充液选择:隔膜压力表弹簧管内灌充的工作液最常用的是硅油和甘油,其他依据工作环境或测量介质不同,还可选择氟化油或植物油甚至水银。
 
  1.Selection of filling fluid for diaphragm pressure gauge:Silicone oil and glycerin are the most commonly used working fluid filled in the spring tube of diaphragm pressure gauge.Fluorinated oil or vegetable oil or mercury can also be selected according to different working conditions or measuring media.
 
  2、隔膜压力表的介质选用:被测量的介质有很强的腐蚀性(如盐酸、湿氯气、三氯化铁),有很高的粘度(如乳胶),易结晶(如食盐水),易凝固(如热沥青),有固态浮游物(如污水),这些介质都可以使用隔膜压力表。
 
  2.Medium selection of diaphragm pressure gauge:the measured medium has strong corrosiveness(such as hydrochloric acid,wet chlorine,ferric chloride),high viscosity(such as latex),easy crystallization(such as salt water),easy solidification(such as hot asphalt),solid plankton(such as sewage),these media can use diaphragm pressure gauge.
 
  3、隔膜压力表的温度影响:隔膜压力表的正常工作温度是-20~60℃;隔膜压力表其温度影响大小与密封系数隔膜刚度及受压部位的温度有关。隔膜压力表在使用环境温度偏离20±5℃时,受温度影响的示值最大变化率刚性不大于0.1%/℃,柔性(远接式)不大于0.1+0.025L%/℃(L为传压导管长度m)。隔膜压力表的温度与密封液体膨胀系数、隔膜刚度及受压温度都有关。量程越低这个现象约明显。
 
  3.Temperature influence of diaphragm pressure gauge:The normal working temperature of diaphragm pressure gauge is-20-60 C;the temperature influence of diaphragm pressure gauge is related to the sealing coefficient,diaphragm stiffness and the temperature of the pressure position.When the ambient temperature of the diaphragm pressure gauge deviates from 20+5 C,the maximum change rate of the indication value affected by temperature is not more than 0.1%/C,and the flexibility(remote connection)is not more than 0.1+0.025 L%/C(L is the length of the pressure transfer conduit m).The temperature of the diaphragm pressure gauge is related to the expansion coefficient of the sealing liquid,the stiffness of the diaphragm and the pressure temperature.The lower the range,the more obvious this phenomenon is.
 
  4、隔膜压力表的液位差说明:配接隔膜压力表在安装时受压部分与通用型压力表处于不同位置时,应该考虑到液位差对压力的影响,仅对于隔膜压力表带软管连接来说。(密封工作液比重大体等于1的,落差1m的压力差约为0.01MPa)。
 
  4.The liquid level difference of the diaphragm pressure gauge shows that when the pressure part of the diaphragm pressure gauge is in different position with the general pressure gauge,the influence of the liquid level difference on the pressure should be taken into account,only for the connection of the diaphragm pressure gauge with the hose.(The pressure difference of 1 m is about 0.01 MPa when the ratio of working fluid to mass is equal to 1).